A good day to you all. i read in a forum somewhere that you can actually rustproof your car by welding two pieces of zinc bars to the chassis and body of your car; supposedly the zinc bars have some electrochemical properties that makes your car repel oxygen, chemicals, etc. Does this truly work?

All outboard engines have a "sacrificial anode", usually made of Zinc. Often this is also the trim tab behind the prop. When immersed in salt water a current flows between the dissimilar metals. I am not sure of the physics but this protects the alluminium alloy of the outboard from corrosion from the salt water ( I think it is ions being passed to the alloy). You can do this to inboards or even cars by putting an annode in the water jacket.

As far as protecting a whole car - I am fairly sure you need it to be in water, and salt at that I think.

You're right Pat, marine applications only. Ships hulls and outboard motors use a sacrificial anode, on a car chassis it will be a heavy and ugly decoration. They also need replacing regularly as they tend to oxidise and shrink over time.

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